Bottom crawler

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A bottom crawler is an underwater exploration and recovery vehicle. It is designed to sink to the bottom of a body of water, where it moves about using traction against the bottom with wheels or treads. It is usually tethered to a surface ship by cables providing power, control, video, and lifting cababilities but this is not required.

Such devices have been proposed for use in recovering deep seabead minerals, such as manganese nodules.

These also have been considered since the late 1960's for use in offshore oil exploration and production in extremely deep water, but practical devices have used other technologies from the sea surface, such as moored barges and tension leg platforms.